The Battle for Wesnoth is a free open source turn-based strategy game with a fantasy theme. You build up a great army by gradually turning raw recruits into hardened veterans. Later in the game, you recall your toughest warriors and form a deadly host against whom no one can stand! Choose the units from a large pool of specialists, and hand-pick a force with the right strengths to fight well on different terrains against all types of opposition.

The world of Wesnoth is very huge and limited only by your creativity. You can make your own custom units, compose your own maps, and write your own scenarios. You can also challenge up to 8 friends – or strangers – and fight in epic multi-player fantasy battles.

Tremulous is a free, open source game that blends a team based first person shooter with elements of a real time strategy. Players can choose from 2 unique races i.e aliens and humans. Players on both teams are able to build working structures in-game like a real time strategy. These structures provide many functions, the most important being spawning. The designated builders must ensure there are spawn structures or other players will not be able to rejoin the game after death. Other structures provide automated base defense (to some degree), healing functions and much more…
Player advancement is different depending on which team you are on. As a human, players are rewarded with credits for each alien kill. These credits may be used to purchase new weapons and upgrades from the “Armoury”. The alien team advances quite differently. Upon killing a human foe, the alien is able to evolve into a new class. The more kills gained the more powerful the classes available.

The overall objective behind Tremulous is to eliminate the opposing team. This is achieved by not only killing the opposing players but also removing their ability to respawn by destroying their spawn structures.

War§ow is one of the best open source first-person shooter game designed to play online. There are many many games that were inspired by War§ow but still War§ow has been very unique. The Gameplay focused on speed, trick jumps and the art of movement.

Scorched 3D is a simple turn-based artillery game that is free and open source. It is also a real-time strategy game in which players can counter each others’ weapons with other creative accessories, shields and tactics. Scorched 3D incorporates a lively three dimensional landscape that includes animated jets, naval vessels, water, and even birds, in addition to detailed tanks and projectiles. Scorched 3D is actually a modernization of the classic DOS game Scorched Earth “The Mother Of All Games” on which it is based.. One can play over LAN and internet play.

Armagetron a free open source software multiplayer game in 3d that attempts to emulate and expand on the lightcycle sequence from the movie Tron. It’s an old school arcade game slung into the 21st century. Highlights include a customizable playing arena, HUD, unique graphics, and AI bots.

Freeciv is a Free and Open Source empire-building strategy game inspired by the history of human civilization. The game commences in prehistory and your mission is to lead your tribe from the stone age to the space age. Its a turn-based multiplayer strategy game, in which each player becomes the leader of a civilization, fighting to obtain the ultimate goal “ To become the greatest civilization”.

Alien Invasion is a free game, licensed under GNU GPL, heavily inspired by the X-COM series by Mythos and Microprose. It is is a strategy game featuring tactical combat against hostile alien forces which are about to infiltrate earth at this very moment. You are in command of a small special unit which has been founded to face the alien strike force. To be successful on the long run, you will also have to have a research team study the aliens and their technologies in order to learn as much as possible about their technology, their goals and the aliens themselves.

FlightGear Flight Simulator is free open source matured, sophisticated, open-source flight simulator software package, created and maintained entirely by volunteers. The goals of the FlightGear project include creating a sophisticated flight simulator framework for use in research or academic environments, for the development and pursuit of other interesting flight simulation ideas, and as an end-user application.

Operating System: Windows, Mac, Linux, Solaris and IRIX

10. Complete Annihilation

Complete Annihilation is a game for the Spring RTS engine. It traces its heritage to Total Annihilation (often referred to as Original Total Annihilation or OTA), a 1997 PC RTS by Cavedog Entertainment. However, CA is not OTA. It is gradually moving away from OTA, replacing the copyrighted models and textures with open-source ones while refining and improving the gameplay. CA aims to be a dynamic, action-packed, hassle-free game, full of clever strategies and constantly moving combat.

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